Hauv kev lag luam xim, kev ruaj ntseg thiab rheology ntawm cov xim muab tshuaj yog qhov tseem ceeb. Txawm li cas los xij, thaum khaws cia thiab siv, cov xim pleev xim feem ntau muaj teeb meem xws li thickening thiab agglomeration, uas cuam tshuam rau kev tsim kho thiab txheej txheej zoo.Hydroxyethyl cellulose (HEC), raws li cov dej-soluble polymer thickener, plays lub luag haujlwm tseem ceeb hauv cov xim pleev xim. Nws tuaj yeem txhim kho cov khoom rheological ntawm cov xim muab tshuaj, tiv thaiv agglomeration, thiab txhim kho kev ruaj ntseg cia.
1. Yog vim li cas rau thickening thiab agglomeration ntawm cov xim xim muab tshuaj txhuam
Lub thickening thiab agglomeration ntawm cov xim pleev xim yog feem ntau muaj feem xyuam rau cov hauv qab no:
Tsis ruaj tsis khov pigment dispersion: Cov pigment hais nyob rau hauv cov xim muab tshuaj txhuam yuav flocculate thiab tswm ciab thaum lub sij hawm cia, uas ua rau ntau lub zos concentration thiab agglomeration.
evaporation ntawm cov dej nyob rau hauv lub system: Thaum lub sij hawm cia, evaporation ntawm ib feem ntawm cov dej yuav ua rau cov viscosity ntawm cov xim muab tshuaj txhuam kom nce, thiab txawm tsim cov khoom qhuav ntawm qhov chaw.
Incompatibility ntawm additives: Qee cov thickeners, dispersants los yog lwm yam additives tej zaum yuav hnov mob nrog ib leeg, cuam tshuam lub rheological zog ntawm cov xim muab tshuaj txhuam, uas ua rau txawv viscosity nce los yog flocculent tsim.
Cov nyhuv ntawm shear quab yuam: Lub sij hawm ntev mechanical stirring los yog twj tso kua mis yuav ua rau kev puas tsuaj ntawm cov polymer saw qauv nyob rau hauv lub system, txo cov fluidity ntawm cov xim muab tshuaj txhuam, thiab ua kom nws nkig los yog agglomerated.
2. Mechanism ntawm kev ua ntawm hydroxyethyl cellulose
Hydroxyethyl cellulose (HEC) yog non-ionic cellulose derivative nrog thickening zoo, rheological hloov peev xwm thiab dispersion stability. Nws lub ntsiab mechanism ntawm kev txiav txim nyob rau hauv cov xim xim paste muaj xws li:
Thickening thiab rheological hloov kho: HEC tuaj yeem ua ke nrog cov dej molecules los ntawm hydrogen bonding los tsim cov txheej txheem dej ruaj khov, ua kom cov viscosity ntawm lub cev, tiv thaiv cov xim ntawm cov xim los ntawm agglomerating thiab nyob, thiab xyuas kom meej tias cov xim muab tshuaj tiv thaiv zoo fluidity thaum sawv los yog kev tsim kho.
Kev ruaj ntseg dispersion system: HEC muaj cov dej num zoo, tuaj yeem pleev xim cov xim, txhim khu lawv cov dispersibility nyob rau hauv cov dej theem, tiv thaiv agglomeration ntawm hais, thiab yog li txo flocculation thiab agglomeration.
Kev tiv thaiv dej evaporation: HEC tuaj yeem tsim cov txheej txheem tiv thaiv, ua kom cov dej ntws qeeb qeeb, tiv thaiv cov xim pleev xim los ntawm thickening vim dej poob, thiab ncua sij hawm cia.
Shear resistance: HEC muab cov xim zoo thixotropy, txo cov viscosity nyob rau hauv siab shear quab yuam, yooj yim rau kev tsim kho, thiab tuaj yeem rov qab viscosity nyob rau hauv qis shear force, txhim kho cov xim tiv thaiv kev ua haujlwm.
3. Qhov zoo ntawm hydroxyethyl cellulose nyob rau hauv cov xim xim muab tshuaj txhuam
Ntxiv hydroxyethyl cellulose rau cov xim xim paste system muaj cov hauv qab no zoo:
Txhim kho qhov ruaj khov ntawm cov xim muab tshuaj txhuam: HEC tuaj yeem tiv thaiv cov xim pleev xim thiab agglomeration, kom ntseeg tau tias cov xim muab tshuaj pleev xim tsis tu ncua tom qab khaws cia ntev.
Txhim kho kev tsim kho kev ua haujlwm: HEC muab cov xim muab tshuaj txhuam zoo heev rheological zog, ua kom yooj yim rau txhuam, yob lossis tshuaj tsuag thaum siv, txhim kho kev tsim kho ntawm cov xim.
Txhim khu kev tiv thaiv dej: HEC tuaj yeem txo qhov viscosity hloov pauv los ntawm cov dej evaporation, kom cov xim pleev xim tuaj yeem tswj kev ruaj ntseg zoo nyob rau hauv ib puag ncig sib txawv.
Strong compatibility: HEC yog non-ionic thickener, uas muaj kev sib raug zoo nrog feem ntau dispersants, wetting agents thiab lwm yam additives, thiab yuav tsis ua rau instability nyob rau hauv formulation system.
Kev tiv thaiv ib puag ncig thiab kev nyab xeeb: HEC yog muab los ntawm cov cellulose ntuj, ua tau raws li kev tiv thaiv ib puag ncig, tsis tso cov khoom phom sij, thiab ua raws li kev tsim kho ntsuab thiab kev tiv thaiv ib puag ncig ntawm cov txheej txheem dej.
4. Kev siv thiab cov lus qhia ntawm hydroxyethyl cellulose
Txhawm rau ua kom zoo dua lub luag haujlwm ntawm HEC, cov ntsiab lus hauv qab no yuav tsum tau sau tseg thaum siv nws hauv cov xim txheej xim muab tshuaj txhuam:
Kev tswj kom tsim nyog ntawm qhov sib ntxiv: Tus nqi ntawm HEC feem ntau yog nyob nruab nrab ntawm 0.2% -1.0%. Qhov tshwj xeeb ntawm kev siv yuav tsum tau hloov kho raws li qhov xav tau ntawm cov txheej txheem txheej txheej kom tsis txhob muaj viscosity ntau dhau thiab cuam tshuam rau kev tsim kho.
Cov txheej txheem ua ntej tawg: HEC yuav tsum tau tawg thiab yaj hauv dej ua ntej, thiab tom qab ntawd ntxiv rau cov xim muab tshuaj txhuam tom qab tsim cov tshuaj sib xyaw kom ntseeg tau tias nws ua tiav nws cov thickening thiab dispersing teebmeem.
Siv nrog rau lwm yam additives: Nws tuaj yeem sib haum nrog cov dispersants, wetting agents, thiab lwm yam.
Tsis txhob muaj qhov kub thiab txias: Lub solubility ntawm HEC cuam tshuam rau qhov kub thiab txias. Nws raug nquahu kom yaj nws ntawm qhov ntsuas kub (25-50 ℃) kom tsis txhob agglomeration lossis dissolution tsis txaus.
Hydroxyethyl cellulosemuaj ib qho tseem ceeb daim ntawv thov nqi nyob rau hauv cov xim xim paste system. Nws tuaj yeem daws cov teeb meem ntawm cov xim paste thickening thiab agglomeration, thiab txhim kho kev ruaj khov thiab kev tsim kho. Nws thickening, dispersion stability thiab tsis kam mus rau dej evaporation ua rau nws yog ib qho tseem ceeb additive rau cov xim raws li dej. Hauv kev siv tswv yim, kev kho kom tsim nyog ntawm HEC ntau npaum li cas thiab cov txheej txheem ntxiv tuaj yeem ua kom nws qhov zoo tshaj plaws thiab txhim kho tag nrho cov xim zoo nkauj. Nrog rau kev txhim kho cov xim pleev xim rau ib puag ncig, daim ntawv thov kev cia siab ntawm HEC yuav dav dua.
Post lub sij hawm: Apr-09-2025